sig·net 
(sĭgnĭt)
(sĭgnĭt)n.
1. A seal, especially one used officially to mark documents.
2. The impression made with such a seal.
tr.v. sig·net·ed, sig·net·ing, sig·nets
To mark or endorse with a signet.
[Middle English, from Old French, diminutive of signe, sign; see SIGN.]